/*
    SPDX-FileCopyrightText: 2014 Christian Dávid <christian-david@web.de>
    SPDX-FileCopyrightText: 2018 Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>
    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "qsqlcipher-test.h"

#include <QTest>
#include <QSqlQuery>
#include <QSqlError>
#include <QSqlResult>
#include <QSqlRecord>
#include <QCoreApplication>

QTEST_GUILESS_MAIN(qsqlciphertest)

static const auto passphrase(QStringLiteral("blue valentines"));
static const auto sqlDriverName(QStringLiteral("QSQLCIPHER"));

void qsqlciphertest::initTestCase()
{
    // without qsqlcipher installed system-wide the test couldn't load qsqlcipher plugin
#ifdef QSQLCIPHERPATH
    QCoreApplication::addLibraryPath(QLatin1String(QSQLCIPHERPATH));
#endif

    // Called before the first testfunction is executed
    auto drivers = QSqlDatabase::drivers();
    QVERIFY(drivers.contains(sqlDriverName));
    QVERIFY(m_file.open()); // open new temporary file just to get it's filename
    m_file.resize(0);       // it's important for the file to be empty during creation of encrypted database
    m_file.close();         // only filename was needed, so close it
    m_db = QSqlDatabase::addDatabase(sqlDriverName);
    QVERIFY(m_db.isValid());
    m_db.setDatabaseName(m_file.fileName());
    m_db.setPassword(passphrase);
    QVERIFY(m_db.open());
}

void qsqlciphertest::cleanupTestCase()
{
    m_db.close();
    m_db = QSqlDatabase();  // otherwise QSqlDatabase::removeDatabase says that m_db is still in use
    m_db.removeDatabase(QSqlDatabase::defaultConnection);
}

void qsqlciphertest::isSQLCipherUsed()
{
    QSqlQuery query(m_db);
    QVERIFY(query.exec("PRAGMA cipher_version"));
    QVERIFY(query.next());  // if that fails, then probably libsqlite3 instead libsqlcipher is in use
    qInfo() << "Cipher version: " << query.value(0).toString();
}

/**
 * taken from @url http://www.keenlogics.com/qt-sqlite-driver-plugin-for-encrypted-databases-using-sqlcipher-windows/
 * thank you!
 */
void qsqlciphertest::createEncryptedDatabase()
{
    QSqlQuery query(m_db);
    QVERIFY(query.exec(QString::fromLatin1("PRAGMA key = '%1'").arg(passphrase))); // this should happen immediately after opening the database, otherwise it cannot be encrypted
    m_file.open();
    // https://www.sqlite.org/fileformat.html#database_header
    auto header = QString(m_file.read(16));
    QVERIFY(header !=  QLatin1String("SQLite format 3\000")); // encrypted database has scrambled content in contrast to its regular SQLite counterpart
    m_file.close();
}

void qsqlciphertest::createTable()
{
    QSqlQuery query(m_db);
    QVERIFY(query.exec("CREATE TABLE test ("
                       "id int PRIMARY_KEY,"
                       "text varchar(20)"
                       ");"
                      ));
    QVERIFY(!query.lastError().isValid());
}

void qsqlciphertest::writeData_data()
{
    data();
}

void qsqlciphertest::writeData()
{
    QFETCH(int, id);
    QFETCH(QString, text);

    QSqlQuery query(m_db);
    query.prepare("INSERT INTO test (id, text) "
                  "VALUES (:id, :text);"
                 );
    query.bindValue(":id", id);
    query.bindValue(":text", text);
    QVERIFY(query.exec());
    QVERIFY(!query.lastError().isValid());
    QCOMPARE(query.numRowsAffected(), 1);
}

void qsqlciphertest::reopenDatabase()
{
    // close the encrypted database...
    m_db.close();
    m_db = QSqlDatabase();
    m_db.removeDatabase(QSqlDatabase::defaultConnection);

    // ... and open it anew
    m_db = QSqlDatabase::addDatabase(sqlDriverName);
    QVERIFY(m_db.isValid());
    m_db.setDatabaseName(m_file.fileName());
    m_db.setPassword(passphrase);
    QVERIFY(m_db.open());

    QSqlQuery query(m_db);
    QVERIFY(query.exec(QString::fromLatin1("PRAGMA key = '%1'").arg(passphrase))); // this should happen immediately after opening the database, to decrypt it properly

    QVERIFY(query.exec("SELECT count(*) FROM sqlite_master;")); // this is a check if the password correctly decrypts the database
    QVERIFY(!query.lastError().isValid());
}

void qsqlciphertest::countData()
{
    QSqlQuery query(m_db);
    QVERIFY(query.exec("SELECT count(id) FROM test;"));
    QVERIFY(query.next());
    QCOMPARE(query.value(0).toInt(), data());
}

void qsqlciphertest::readData_data()
{
    data();
}

void qsqlciphertest::readData()
{
    QFETCH(int, id);
    QFETCH(QString, text);

    QSqlQuery query(m_db);
    query.prepare("SELECT id, text FROM test WHERE id = :id;");
    query.bindValue(":id", QVariant::fromValue(id));
    QVERIFY(query.exec());

    QVERIFY(!query.lastError().isValid());
    QVERIFY(query.next());

    QSqlRecord record = query.record();
    int idIndex = record.indexOf("id");
    QVERIFY(idIndex != -1);
    int textIndex = record.indexOf("text");
    QVERIFY(textIndex != -1);

    QCOMPARE(query.value(0).toInt(), id);
    QCOMPARE(query.value(1).toString(), text);
    QVERIFY(!query.next());
}

int qsqlciphertest::data()
{
    QTest::addColumn<int>("id");
    QTest::addColumn<QString>("text");

    int i = 0;
    QTest::newRow("string Hello World") << ++i << "Hello World";
    QTest::newRow("string 20 characters") << ++i << "ABCDEFGHIJKLMNOPQRST";
    QTest::newRow("simple string") << ++i << "simple";

    return i; // return number of rows!
}
